**When using this upper for a 9mm or .40 build you must either use a carbine buffer with our buffer spacer, or a 9mm LONG buffer. Not following these instructions could cause damage to the rear door of the upper that will NOT be covered under warranty**

The New Frontier Armory Side Charging AR-9 Stripped Billet Upper with LRBHO is proudly MADE IN THE USA by hard working American men and women.